有序介孔碳对 CO2、CH4、N2O 和 NH3 的吸附平衡和动力学。
Adsorption equilibrium and kinetics of CO2, CH4, N2O, and NH3 on ordered mesoporous carbon.
机构信息
Chemical Engineering Department, New Mexico State University, Las Cruces, NM 88003, USA.
出版信息
J Colloid Interface Sci. 2010 May 15;345(2):402-9. doi: 10.1016/j.jcis.2010.01.076. Epub 2010 Feb 1.
Ordered mesoporous carbon was synthesized by a self-assembly technique and characterized with TEM, Raman spectroscopy, and nitrogen adsorption/desorption for its physical and pore textural properties. The high BET specific surface area (798 m(2)/g), uniform mesopore-size distribution with a median pore size of 62.6 Å, and large pore volume (0.87 cm(3)/g) make the ordered mesoporous carbon an ideal adsorbent for gas separation and purification applications. Adsorption equilibrium and kinetics of carbon dioxide, methane, nitrous oxide, and ammonia on the ordered mesoporous carbon were measured at 298 K and gas pressures up to 800 Torr. The adsorption equilibrium capacities on the ordered mesoporous carbon at 298 K and 800 Torr for ammonia, carbon dioxide, nitrous oxide, and methane were found to be 6.39, 2.39, 1.5, and 0.53 mmol/g, respectively. Higher adsorption uptakes of methane (3.26 mmol/g at 100 bar) and carbon dioxide (2.21 mmol/g at 13 bar) were also observed at 298 K and elevated pressures. Langmuir, Freundlich, and Toth adsorption equilibrium models were used to correlate all the adsorption isotherms, and a simplified gas diffusion model was applied to analyze the adsorption kinetics data collected at 298 K and four different gas pressures up to 800 Torr.
有序介孔碳通过自组装技术合成，并通过 TEM、拉曼光谱和氮气吸附/脱附对其物理和孔结构性质进行了表征。高 BET 比表面积（798 m²/g）、均匀的中孔尺寸分布（中值孔径为 62.6 Å）和大孔体积（0.87 cm³/g）使有序介孔碳成为气体分离和净化应用的理想吸附剂。在 298 K 和高达 800 Torr 的气体压力下，测量了二氧化碳、甲烷、氧化亚氮和氨在有序介孔碳上的吸附平衡和动力学。在 298 K 和 800 Torr 下，有序介孔碳对氨、二氧化碳、氧化亚氮和甲烷的吸附平衡容量分别为 6.39、2.39、1.5 和 0.53 mmol/g。在 298 K 和升高的压力下，还观察到甲烷（在 100 bar 时为 3.26 mmol/g）和二氧化碳（在 13 bar 时为 2.21 mmol/g）的吸附摄取量更高。Langmuir、Freundlich 和 Toth 吸附平衡模型被用于关联所有的吸附等温线，简化的气体扩散模型被用于分析在 298 K 和四个不同气体压力下（高达 800 Torr）收集的吸附动力学数据。
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